US1434947A - Tumbler lock - Google Patents

Description

J. B. FREYSINGER.

TUMBLER LOCK- APPLICAIION FILED MAR. 27, 1922- 1,434,947, Patented Nov. 7,1922;

attoznuqs reamed Nov. 7, 1922,

, UNITED STATES PATENT wer JOHN B. FREYSINGER, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE & TO

MANUFACTURING COMPANY,

OF STAMFORD, CONNECTICUT.

TUMBLER LOCK;

, Application .filed March 27, 1922. Serial No. 5i t7,286.'

To all 10 [mm it may concern Be it known that I, JOHN B. Fnnrsmenn,

a citizen of the United States, and a resi able others-.skilled in the art towhich it appertains to make and use the same.

My invention relates to an improvement in tumbler locks, the object being to reinforce the cylinder and plug so as to prevent the penetration of a cutting or boring tool from the outer side or face of the cylinder or plug, sufficiently to engage and destroy or render inoperative all the tumblers and thus release the plug, and my invention consists in a cylinder having a bore for the plug and hardened metal pins secured within the cylinder around the plug sufficiently close together to prevent the entrance of a boring tool between them.

It further consists in a cylinder armored as above described in combination with a plug having hardened metal pins arranged longitudinally on opposite sides of the key slot so as to prevent access to the tumblers by boring introduced through the face of the plug.

In the accompanymg drawings, Figure 1 is a view in front elevation of a pin tumbler lock embodying my invention; Figure 2 is a rear elevation, the cam or the plug for actuating the-lock mechanism being omitted; Figure 3 is a view in longitudinal section of the cylinder and plug taken through the hardened pins and Figure dis a view in transverse section.

10 represents the cylinder provided centrally with a bore to receive the plug 11, the latter being held in the cylinder in any approved manner, and provided with a cam or other device, not shown, for actuating the mechanism of the lock to which the tumbler lock is applied.

The lock may be of the sliding or pin tumbler type, the latter being shown, and the tumbler chambers may be of the single or double construction as preferred topermit of the removal of the key at half, instead of a full revolutioi'i which however is not material so far as my present invention, is concerned; g p

12 are hardenedsteel pins driven into the cylinder 10 at the rear of the latter and so disposed and so close to each other as to prevent the entrance of any cutting tool between them. hardenednt their front ends and left soft at their rear ends so that they may v be machined and are located. sufficiently close to the. bore in the cylinder, in WhiCllthG plug is mounted to turn to prevent'the entrance of a boring tool between them and the plug 11.

The rear end of the plug 11 is of greater diameter than the front end, hence the rear softer ends of the pins 12 are cut away to conform to the bore in the cylinder to receive the large rear end of the plug.

The pins 12 stop short of the front face of the cylinder which latter is preferably made of softer and non-corrosive metal, so that they do not show at the front, but they extend from the rear to the front sufficiently far toprotect some or all of the tumblers to prevent the destruction of some of the tumblers which, as is well known, hold the plug against turning movement except whenv actuated by the proper key.

The plug 11 projects through the cylinder thus formed, and it is protected, by a plurality, preferably four steel pins 13 driven lengthwise therein from the rear end at opposite sidesof the key slot 14, and preferably terminate, though not necessarily so, short of the front of the face plate of the plug so as not to be exposed in the front. They extend however in front of some and preferably all of the tumblersso are in position to protect the latter against the attack of a boring tool, and the front ends are hardened and the rear ends preferably left soft to permit them to be se curely fastened within the plug.

In this construction the hardened steel pins surrounding the plug and the hardened steel pins in the plug, at opposite sides of the key hole in the latter, prevent sufficient penetration of a boring tool to destroy or render ineffective the pins or tumblers which as before explained hold the plug against turning movement, except when they are actuated by the proper key.

\ a in ervals n Having fully described my invention what I claim as new and desire to secure by Letters Patent, is

1. A tumbler lock cylinder having a central bore for the plug and provided with a plurality of hardened steel pins located circular form around said bore. a v I 1 2. A tumbler lock cylinder having a central bore for the plug and provided with longitudinally arranged pins located at in tervals around the bore, the outer ends of said pins being hardened and of material harder than the cylinder.

3. A tumbler lock comprising a cylinder and a plug mounted to turn in the cylinder, the latter being provided with a plurality *of hardened steel pins located in'a circle at intervals around the" bore for the plug,

and the latter having a plurality of hardened pins located at opposite sides of the key slot. 4. A tumbler lock compris ng a cylinder and a plug mounted to turn in the cylinder, I i

the former being provided with a plurality of steel pins, harder at their front ends than at their rear ends and located at in tervalsaround the bore of the plug.

5. A tumbler lock comprising a cylinder and a plug mounted to turn in the cylinder, the said cylinder and plug having a plurality of hardened steel pins, the pins in the cylinder surrounding and adjacent the plug and the pins in the plug being at oppositesides of the key slot in the latter.

6. A tumbler lock comprising a cylinder and a plug mounted to turn in the cylinder the latter being provided with a :plurality of hardened steel pins surrounding the plug and stopping short of the front end of the cylinder. y

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses. i y JOHN B. FR EY SINGER. Witnesses: p

1 RED S. LooKWoop, C AS. B RizY.

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